Area and Surface Area- Day 10

Bases and Heights of Triangles

Lesson 10

Objective:

Today I will evaluate the usefulness of different base-height pairs so that I can draw and label the height that corresponds to a given base. I know I am successful when I complete Cool Down 10 to earn a 4.

An Area of 12

On the grid, draw a triangle with an area of 12 square units. Try to draw a non-right triangle. Be prepared to explain how you know the area of your triangle is 12 square units.

Multiple Select

I'm completing the activity:

• online

• in my book

Hunting for Heights

Here are three copies of the same triangle. The triangle is rotated so that the side chosen as the base is at the bottom and is horizontal. Draw a height that corresponds to each base. Use an index card to help you.

Draw a line segment to show the height for the chosen base in each triangle.

Multiple Select

I'm completing the question

• online

• in my book

Some Bases Are Better Than Others

For each triangle, identify and label a base and height. If needed, draw a line segment to show the height.

Then, find the area of the triangle. Show your reasoning. (The side length of each square on the grid is 1 unit.)

Multiple Select

I'm completing the question

• online

• in my book

Open Ended

The area of triangle A is...

Open Ended

The area of triangle B is...

Open Ended

The area of Triangle C is...

Open Ended

The area of triangle D is...

Poll

After this lesson I feel...

• 😎

• 😃

• 😥

• 🙁